Experimental Study on Measurement of Drag Coefficient of Sandy Soil Nonlinear Vadose

Table 1

Values of average particle size in different particle size intervals.

Particle size (mm)	0.1–0.25	0.25–0.5	0.5–1	1–2	2–5
The average grain diameter (mm)	0.175	0.375	0.75	1.599	2.057